Week 3 Practice Quiz

Question 0

During ionisation, water molecules disrupt the ionic bonds of a solute and a mixture of ions is produced. These ions are called
A) cations
B) anions
C) dissociates
D) electrolytes
E) anti-ions

Answer 0

D) electrolytes

Question 1

Which of the following statements about water is NOT correct?
A) is composed of polar molecules
B) is responsible for about 2/3 of the mass of the human body
C) has a relatively low heat capacity
D) can be considered a “universal solvent”
E) contains hydrogen bonds

Answer 1

C) has a relatively low heat capacity

Question 2

If a molecule has two equal and opposite electrically charged poles separated by a short distance, it is said to be
A) hydrophilic
B) hydrophobic
C) dipolar
D) tripolar
E) colloid

Answer 2

C) dipolar

Question 3

In an aqueous solution, cations move toward
A) water
B) sodium
C) potassium
D) anions
E) hydrogen ions

Answer 3

D) anions

Question 4

In an aqueous solution, sodium would move toward
A) potassium
B) chloride
C) sodium
D) water
E) A and B

Answer 4

B) chloride

Question 5

A solution containing equal numbers of hydrogen ions and hydroxide ions is
A) acidic
B) basic
C) neutral
D) alkaline
E) ionated

Answer 5

C) neutral

Question 6

Which of the following substances would be least acidic?
A) lemon juice, pH = 2
B) urine, pH = 6
C) tomato juice, pH = 4
D) white wine, pH = 3
E) stomach secretions, pH = 1

Answer 6

B) urine, pH = 6

Question 7

If a substance has a pH that is greater than 7, it is
A) neutral
B) acidic
C) alkaline
D) a buffer
E) a salt

Answer 7

C) alkaline

Question 8

An important buffer in body fluids is 
A) NaCl
B) NaOH
C) HCl
D) NaHCO3
E) H2O

Answer 8

D) NaHCO3

Question 9

In the body, inorganic compounds
A) can serve as buffers
B) can make up proteins
C) are important nutrients
D) are structural components of cells
E) both A and D

Answer 9

A) can serve as buffers

Question 10

Hydrophilic molecules readily associate with
A) lipid molecules
B) hydrophilic molecules
C) water molecules
D) A and B
E) all of the above

Answer 10

C) water molecules

Question 11

Inorganic compounds that are soluble and whose ions will conduct an electrical current are called
A) hydrophobic
B) electrolytes
C) covalent bond
D) polar covalent molecules
E) hydration spheres

Answer 11

B) electrolytes

Question 12

A nanometer is
A) 10-6 meter
B) 10-8 meter
C) 10-9 meter
D) 10-10 meter
E) 10-12 meter

Answer 12

C) 10-9 meter

Question 13

An excess of hydrogen ions in the body fluids can have disastrous results because
A) excess hydrogen ions can break chemical bonds
B) excess hydrogen ions can change the shape of large complex molecules, rendering them nonfunctional
C) excess hydrogen ions can disrupt tissue function
D) all of the above
E) A and B only

Answer 13

D) all of the above

Question 14

An inorganic compound, when placed in water, dissociates 99 percent forming hydrogen ions and anions. This substance would be
A) a strong base
B) a weak base
C) a strong acid
D) a weak acid
E) a salt

Answer 14

C) a strong acid

Question 15

When a small amount of hydrochloride acid is added to a solution of Na2HPO4, the pH of the solution does not change. The pH does not change when a small amount of NaOH is added either. Based on these observations, all of the following are true concerning the compound Na2HPO4, except
A) Na2HPO4 is able to accept extra hydrogen ions from the HCl
B) Na2HPO4 is able to donate hydrogen ions to the OH- from NaOH
C) Na2HPO4 absorbs excess H+ and OH- directly onto the surface of its crystalline structure
D) Na2HPO4 is a salt formed from reacting a strong base with a weak acid
E) Na2HPO4 acts as a buffer

Answer 15

C) Na2HPO4 absorbs excess H+ and OH- directly onto the surface of its crystalline structure

Question 16

An acid
A) dissociates into H+ ions and cations in water
B) is a proton acceptor
C) has a pH less than (<) 7
D) A and B are correct
E) A, B and C are correct

Answer 16

C) has a pH less than (<) 7

Question 17

A salt
A) dissociates into H+ and OH- in solution
B) prevents drastic changes in pH in body fluid
C) is a proton donor
D) is a product of the reaction of an acid with a base
E) is the product of a decomposition reaction

Answer 17

D) is a product of the reaction of an acid with a base

Question 18

Which of the following never has an alkaline pH in a healthy person?
A) gastric juice
B) urine
C) semen
D) blood
E) pancreatic juice

Answer 18

A) gastric juice

Question 19

Buffers
A) convert weak acids or bases into strong ones
B) help destabilised pH
C) can absorb OH- if the pH is too low
D) can release H+ if the pH is too high
E) include the HCl - KOH system

Answer 19

D) can release H+ if the pH is too high

Question 20

Which of the following is TRUE regarding this situation: Solution A has a pH of 7.48 and Solution B has a pH of 7.39:
A) solution b is more acidic than solution a
B) the pH of solution A falls within the homeostatic pH range for extra cellular body fluids, but the pH of solution b does not.
C) solution A contains a higher concentration of hydrogen ions that solution B
D) solution B contains a higher concentration of hydrogen ions than solution A
E) Both B and C are correct

Answer 20

D) Solution B contains a higher concentration of hydrogen ions than Solution A

Question 21

A common buffer found in extracellular fluid is
A) glucose
B) bicarbonate ion
C) sodium ion
D) a triglyceride
E) ATP

Answer 21

B) bicarbonate ion

Question 22

An acid has a pH ________ _________7

Answer 22

Less than

Question 23

_______ are chemical compounds that help the body maintain homeostasis by preventing drastic changes in the pH of body fluids

Answer 23

Buffers

Question 24

In a healthy person, the pH of blood is maintained by buffers in the range of _______ to _______.

Answer 24

7.35 to 7.45